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In addition, effective October&#160;1, 2026, in the SAI, corresponding changes are made to the &#x201c;Management of the Trust-Supervisory and Administrative Fee Rates&#x201d; section. &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"&gt;&lt;span style="text-decoration:underline"&gt;PIMCO Global Bond Opportunities Portfolio (Unhedged) &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;text-indent:4%;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:justify;"&gt;&lt;span style="font-style:italic"&gt;Effective October&#160;1, 2026, the supervisory and administrative fee for Administrative Class, Advisor Class&#160;and Institutional Class&#160;shares of the Portfolio, each stated as a percentage of the Portfolio&#x2019;s average daily net assets, will each decrease by 0.05%. These supervisory and administrative fee decreases will result in the Portfolio&#x2019;s Management Fees decreasing by 0.05% for each of the Administrative Class, Advisor Class&#160;and Institutional Class&#160;shares of the Portfolio. &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;text-indent:4%;font-size:10pt;font-family:times new roman;text-align:justify;"&gt;&lt;span style="font-style:italic"&gt;Accordingly, effective October&#160;1, 2026, in the Prospectus, corresponding changes are made to the Portfolio&#x2019;s Annual Portfolio Operating Expenses table and the Expense Examples following the table in the &#x201c;Portfolio Summaries&#x201d; section, and to the &#x201c;Management of the Portfolios-Management Fees&#x201d; and &#x201c;Management of the Portfolios-Management Fees-Supervisory and Administrative Fee&#x201d; sections. 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In addition, effective October&#160;1, 2026, in the SAI, corresponding changes are made to the &#x201c;Management of the Trust-Advisory Fee Rates&#x201d; section. &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"&gt;&lt;span style="text-decoration:underline"&gt;PIMCO International Bond Portfolio (U.S. Dollar-Hedged) &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;text-indent:4%;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:justify;"&gt;&lt;span style="font-style:italic"&gt;Effective October&#160;1, 2026, the supervisory and administrative fee for Administrative Class, Advisor Class&#160;and Institutional Class&#160;shares of the Portfolio, each stated as a percentage of the Portfolio&#x2019;s average daily net assets, will each decrease by 0.10%. 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      id="t_4_a9bdf657_f392_b3f6_684d_fffbb387b98e">&lt;div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;"&gt;PIMCO Variable Insurance Trust &lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;"&gt;Supplement Dated August&#160;21, 2026 to the &lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;"&gt;Administrative Class&#160;Prospectus, Advisor Class&#160;and Class&#160;M Prospectus and Institutional Class&#160;Prospectus (each, a &#x201c;Prospectus&#x201d;) and Statement of Additional Information (&#x201c;SAI&#x201d;), each dated April&#160;30, 2026, each as supplemented from time to time&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;"&gt;Disclosure Related to the PIMCO All Asset Portfolio, PIMCO Global Bond Opportunities Portfolio (Unhedged), PIMCO Global Managed Asset Allocation Portfolio and PIMCO International Bond Portfolio (U.S. Dollar-Hedged) (each, a &#x201c;Portfolio&#x201d; and together, the &#x201c;Portfolios&#x201d;) &lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"&gt;&lt;span style="text-decoration:underline"&gt;PIMCO All Asset Portfolio &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;text-indent:4%;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:justify;"&gt;&lt;span style="font-style:italic"&gt;Effective October&#160;1, 2026, the supervisory and administrative fee for Administrative Class, Advisor Class, Class&#160;M and Institutional Class&#160;shares of the Portfolio, each stated as a percentage of the Portfolio&#x2019;s average daily net assets, will each decrease by 0.05%. These supervisory and administrative fee decreases will result in the Portfolio&#x2019;s Management Fees decreasing by 0.05% for each of the Administrative Class, Advisor Class, Class&#160;M and Institutional Class&#160;shares of the Portfolio. &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;margin-bottom:0pt;text-indent:4%;font-size:10pt;font-family:times new roman;text-align:justify;"&gt;&lt;span style="font-style:italic"&gt;Accordingly, effective October&#160;1, 2026, in the Prospectus, corresponding changes are made to the Portfolio&#x2019;s Annual Portfolio Operating Expenses table and the Expense Examples following the table in the &#x201c;Portfolio Summaries&#x201d; section, and to the &#x201c;Management of the Portfolios-Management Fees&#x201d; and &#x201c;Management of the Portfolios-Management Fees-Supervisory and Administrative Fee&#x201d; sections. In addition, effective October&#160;1, 2026, in the SAI, corresponding changes are made to the &#x201c;Management of the Trust-Supervisory and Administrative Fee Rates&#x201d; section. &lt;/span&gt;&lt;/div&gt;</oef:SupplementToProspectusTextBlock>
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